Antennas::.. Return

Antennas
The formulas for a dipole and vertical
Half-wave antenna in free space 15006/F (см)
Real Half-wave the antenna (up to 30 MHz) 14274/F (см)
Half-wave antenna (from 50 up to 144 MHz) 14030/F (см)
Half-wave antenna (more than 144 MHz) 14233/F (см)
Quarter the wave antenna 7137/F (см)
Length of the wave antenna 30653/F (см)
Enter frequency: (MHz)
J-Antenna
Enter frequency
(MHz)
A = (см)
B = (см)
C = (см)
( Rin=50 Ом)
D = (см)

 

 J-ant
" A Double square "

The antenna with an adjustment apron (version А)

Length of the party of each framework = 7564/F (MHz) (см)
Spacing intervals between frameworks A = 3599/F (MHz) (см)

The antenna with a reflector as a selfcontained closed loop (version B)

Length of the party of the vibrator = 7625/F (MHz) (см)
Length of the party of a reflector = 7869/F (MHz) (см)
Spacing intervals between frameworks A = 3599/F (MHz) (см)
Enter frequency: (MHz)
The formulas for the antenna YAGI

2 element YAGI (version А)

Length of the radiator = 14518/F (MHz) (см)
Length of the director = 13725/F (MHz) (см)
Spacing interval between members A = 3660/F (MHz) (см)

3 element YAGI (version B)

Length of the radiator = 14426.5/F (MHz) (см)
Length of a reflector = 15280.5/F (MHz) (см)
Length of the director = 13572.5/F (MHz) (см)
Spacing interval between members A = 7137/F (MHz) (см)
Enter frequency: : (МГц)
The Y-figurative scheme of the coordination of antennas YAGI
Band, м Length L of a handset of the scheme, см Spacing interval A, см Maximum rating of capacitance of a variable capacitor C, pF
2

10

15

20

40

 16,5

80

120

170

300

 2

10

14

16

22

 18

50

80

150

250

 
In the table the approximate data for the y-figurative scheme of the coordination are adduced. The indicated values are suitable only in that case, when the input resistance of the antenna lies in limits from 15 up to 30 Ohm and the coordination is made with a coaxial cable with a wave drag 50... 70 Ohm.
 

Calculation of the coil for EH antennas

----- Parameters -----

Frequency

МHz

Pas

Diameter of a pipe

cm

X sub L

Ом

Coils / cm

Coaxial

Ом


----- Settlement values -----

Quantity of coil coils
Length of winding cm
Inductance uH
Length of a wire cm
The coil of communication coils
 
Design: Yushpe Lev
Mail: 4z5ny@qslnet.de
ICQ: 115172493

Skype: blackfox_4z5ny
Provider: Denis, DL5SFC

Provider:

© All rights reserved. At a reprint of any material from a site the link on http://www.qslnet.de/4z5ny is obligatory.

For viewing best at 1024*768, with browser Internet Explorer is recommended. For more effective viewing press F11.